Calipers



Patented Nov. 4, i926?.

'rra errar.

.KARL KESSENDORFER, 0F @BERNDORF-'ON-THE-NECKAR, GERMANY.

cALIrEns.

Application filed November 20, 1923. Serial No. 675,855.

T0- aZZ' whom t may concern:

Be it known that l, KARL KIssENDoRFnn, a citizen of the German Republic, residing at @berndorf-on-thedVeckar, Germany, have invented certain new :and useful improve4 rical adjustment of the slide of the vernier.

In a construction of this kind, however, a serious disadvantage arises from the Vfact that the slide of the vernier in turn cannot be fixed by means of its fixing screw except after the micrometrical adjustmenthas been carried out, whereby the set measurement, that is to say, the measuring position of the slide ofthe vernier, will be changed. The measuring differences thus occurring and consequent incorrect readings are an objectionable particularit-y of calipers of the stated type.

This invention relates to an improved beam caliper of the said type and the object of the invention is to provide means for remedying the defect hereinbefore indicated. lVith this object in view the improvement consists in locating the micrometer screw within a recess in the slide of the vernier so as lto dispense thereby with the provision of the usual second slide, and to enable the micrometrical adjustment of the slide by means of the nut 'of said screw, while the latter is adapted to be fixed automatically by jamming on the beam independently of the :slide of the Vernier.

With this and other objects in view the present invention consists in the combination and -arrangement of' parts, as will be hereinafter more fullyv described, yshown in the accompanying drawings and particularly pointed outfin the appended claims.

In the drawings Figure l is a side view of the caliper to illustrate, by way of ei;- ample, a preferred embodiment of the invention; j

Figure 2 is a longitudinal section of the slide of the Vernier, otherwise termed the movable jaw, with the micrometer screw shown in full view, but with the nut de tached;

Figure 3 is a cross-section on the line A-B of Figure l and Figure 4: is a sectional view of a preferred construction of the micrometer nut Vand adjacent parts.

ln the embodiment shown `the caliper comprises, asy usual, a beam a, -a ,doubl transverse arm or jaw?) int-egral with the beam and an adjustable jaw c, the lso-,called slide of the vernier, mating therewith and adapted to slide on the beam a under the control of a guiding or braking spring Z which is of usual construction and arrangement. l

' As will be seen in Figure Q the movable jaw c is recessed -as at e and abrakingmember is housed in the recess @,fthe sai-d member being loosely inserted therein, `so as to have a certain freedom of playinthe plane of the jaw. The braking member is of angular construction comprising -a narrow sha-nk or arm f adaptedfto engage in a longitudinal groove h in the beam, when the parts are duly assembled, so that the broader shank or arm g thereof will be maintained in a position perpendicular to the jaw c. .Pivotally `connected to the arm g ofthe twoarmed braking member is a micrometer screw c', the pivoted'headof the screwbeing shapedto forma jamming member j. The body or stem of the screw works in a longitudinal recess in the movable aw, while the nut ,t lon the screw is adapted to engage in a transverse slot or recess in the jaw c and is provided with a resilient disk orvcap m to tit snugly therein so as to prevent the screw from back-lashing.

To this end and in order-to ensure "a snug fitting of the n ut le in the transverse slot or recess in the jaw c, the nut is provided with a coaxial circular recess for thereception of a coiled spring s and of the aforesaid disk or cap m. The pressure exerted by the spring s on the nut and on the cap m answers the requirements both of avoiding back-lash between the nut and the screw i and of ensuring a snug engagement of the nut in the transverse recess in the jaw c.

The micrometer screw z' is forced constantly outwards by means of a coiled spring 79 embedded in a bore in the jaw c, in order to keep the head j of the screw in jamming engagement with the contiguous edge of the beam a, so that the shank or arm f of the braking member engaging in the longitudinal groove 71, of the beam ci will likewise be jammed. In this manner the jaw c will be automatically set or Xed at any position on the beam with relation to the rigid jaw Zi. As both the braking arm f' and the jamming head j of the micrometer screw c' allow the jaw c to be adjusted longitudinally to any desired extent, due to the amount of free play afforded by the size of the recess e, such movement can be brought about readily by turning the nut lo, the micrometrical adjustment being effected by means of the Vernier. By lifting the nut 7c from its'engaging seat in the transverse recess of the c, the screw t', which acts as a kind of a braking lever, will be turned outwards into a position such as shown in Figure 2, so that the jamming and braking effect of the parts f and ,7' will be discontinued and the jaw c may be readily adjusted along the beam.

In the caliper shown in the drawings an auxiliary bar r for measuring depth and the like is provided in the beam so as to be adjustable therein. The groove receiving and guiding the said bar in the beam coincides with the groove 7L guiding the braking arm f so that a single groove is utilized for both purposes. A particular advantage of the improved caliper further resides in the fact that the scales may be of any desired length since there is no obstacle, such as the second slide hitherto used, to the utilization of the whole of the length of the beam for scales and reading purposes.

Though only one speciiic embodiment of the invention has been described in the above specification with great particularity of detail, yet it is not to be understood therefrom that the invention is limited to the particular embodiment disclosed. Various modifications in detail and in the arrangement of the parts as well as changes in the form, proportion and size may be made within the scope of the claims without departing from the spirit or sacrilicing any of the advantages oii the invention.

What I claim is:

l. A beam caliper, comprising a beam; a Xed jaw thereon; a second jaw movable along said beam and having a slot; a pivotally-mounted micrometer screw; an adjusting nut on the screw movable with the same into said slot to couple the screw to the movable jaw; and means to which said screw is pivoted for jamming the latter on the beam independently of the movable jaw.

2. A beam caliper, comprising a beam; a iixed jaw thereon; a second jaw movable along said beam and having a slot; a pivotally-mounted micrometer screw; an adjusting nut on the screw movable with the same into said slot to couple the screw to the movable aw; means to which said screw is pivoted for jamming it on the beam independently oit the movable aw; and resilient'means for holding the jamming means in its jammed position.

3. A beam caliper, comprising a beam; a

immessa fixed jaw thereon; a second jaw movable along said beam and having a longitudinal recess and a transverse slot intersecting the same; a micrometer screw movable into said recess; an adjusting nut on the screw movable therewith into said slot to couple the screw to the movable jaw; and means to which said screw is pivoted for jamming it on the beam independently of the movable jaw.

1t. A beam caliper, comprising a beam; a fixed jaw thereon; a second jaw movable along said beam and having a longitudinal recess, and also having a transverse slot and a bore communicating with said recess; a

micrometer screw movable into said recess; an adjusting nut on the screw movable therewith into said slot to couple the screw to the movable jaw; means to which said screw is pivoted for jamming it on the beam independently of the movable jaw; and a spring in said bore tending to move said screw outwardly of said recess and thereby hold said jamming means in its jammed position.

5. A beam caliper, comprising a beam; a iixed jaw thereon; a second jaw movable along said beam and having a longitudinal recess, and also having a transverse slot and a bore communicating with said recess; a micrometer screw movable into said recess; an adjusting nut on the screw movable therewith into said slot to couple the screw to the movable jaw; a jamming member connected to said screw and adapted ior engagement with the beam; a braking member within the movable jaw to which the screw and its jamming member are pivoted, said braking member being cooperative with said jamming member; and a spring in said bore tending to move said screw outwardly of said recess and thereby hold said jamming member in its ammed position.

G. A beam caliper, comprising a beam having a longitudinal groove; a fixed jaw thereon; a second jaw movable along said beam and formed with a longitudinal recess at one side thereof, and with a transverse slot intersecting said recess; a micrometer screw movable into said recess; an adjusting nut on said screw movable therewith into said slot to couple the screw to the movable jaw; a jamming head on the inner end of the screw for engagement with the beam; and a two-armed braking member loosely fitting in a second recess in the movable aw and having one arm slidably engaged in the beam groove and the other arm pivotally connected to said jamming head.

7. A beam caliper, comprising a beam having a longitudinal groove; a fixed jaw thereon; a second jaw movable along said beam and formed with a longitudinal recess at one side thereof, and with a transverse slot communicating with said recess;

lOO

a micrometer screw movable into said recess; en adjusting nut on said screw movabletherewith into said sloty to couple the screw to the movable jaw; a, jamming head on the inner end ot' the screw for engagement with the beam; a two-armed braking member loosely fitting in a second recess in the movable jaw and having one arm slidably enge-ged in the beam groove and the other arm pivotally connected to said jamming head; and e spring mounted in the bore ot the movable jaw and tending to move said screw outwardly of the firstnamed recess and thereby hold the jamming head in its jammed position.

8. A beam caliper, comprising a beam having e. fixed jaw thereon; a movable jaw slidable on said beam and having a. slot therein; :1y micrometer screw on said movabie jew; a nut threaded on said screw and adapted to be swung into and out of said slot; and clamping means connected with said serew and adapted to be actuated by the same, whereby the screw is clamped to or released from said beam according as said nut is swung into or out ot engagement in the slot.

ln testimony whereof l aiix my signature.

KARL KSSENDORFER. 

